This weekend, American legend Floyd Mayweather will fight Philippine great Manny Pacquiao at the MGM Grand in Las Vegas.

Mayweather and Pacquiao are widely recognised as the two best boxers in the world – and it is a rare thing to have two all-time greats fighting in the same weight division at the same time, at least these days.

Mayweather, 38, is unbeaten in 47 professional fights stretching back to 1996 and has won world titles in five different weight classes. Pacquiao, 36, is a six-weight world champion (some say eight, although that includes a couple of minor belts) but has been beaten five times in 64 fights since turning pro in 1995. Mayweather’s WBC and WBA welterweight titles and the WBO title owned by Pacquiao will be up for grabs, not to mention the sure to be astronomical cash prizes at stake.

Former heavyweight world champion Mike Tyson has thrown in his two cents regarding the fight and is behind Manny Pacquiao to cause an upset in the fight. He predicted that the match wouldn’t last long. “I think it’s gonna be a knockout,” he said. “I don’t think it’s gonna go the distance.” He added that Pacquiao was, “very elusive and might be hard to hit.”

On the other hand, Floyd Mayweather’s father and trainer, Mayweather Sr believes his son will knock Pacquiao out as he has never recovered from being knocked out by Juan Manuel Marquez in 2013.

“Once you get hit like Pacquiao got hit by Marquez, it won’t take too many more punches until it happens again,” said Mayweather Sr.